Bell DDA-EXT-1 User's Manual
Contents
1. Bell Wiring for DDA Extended Halo Systems ystem Telephones Ltd DDA EXT 1 VR S Telephone Models 801 801S 801PS 500D 500PD Door Panel DDA Interface PCB Electrical Cupboard These 2 Connections must be doubled gt Ss amp S3 is Ss 340C Power Supply Fail seare 203 204 Lock Release Button www bellsystem co uk PD 176 Issue 1 Installation of Door Entry Systems Important Safety Information The Power Supply Unit must be placed in a protected indoor environment such as an electrical cupboard close to a 240V AC electrical supply and located close to the entrance It must be wall mounted onto plasterboard wood or a similar non conductive material Connections to the 240V AC mains supply must be carried out by a qualified electrician or similar competent person and made in accordance with accepted safety practices A two pole switch as provided by a Consumer Unit or Switch Fuse must be included to isolate both Live and Neutral during Installation or Maintenance The transformer is protected by fuses always replace these with the correct type and rating Use only mains cable to BS6004 or equivalent within the following specified limits Conductor Diameter Min 1 0mm 0 8mm Max 2 25mm 4mm The Door Entry Telephone is designed to be wall mounted in a convenient indoor location The Entrance panel containing the speech unit a2. nd DDA interface is available with either a surface or flush mounting back box Normally this would be mounted on an outside wall near the front door and if possible in a sheltered location The Model 203 Electric Lock Release is designed for use on an inward opening door fitted with a surface night latch type lock This should be installed with a small amount of play on the door as operation will be impaired if too tight Cable requirements For optimum speech clarity it is strongly recommended that this system is installed using twisted pair telephone cable eg type CW1308 unless otherwise stated Use one of the pairs for the R amp Oconnections between the speech unit and the telephone Speech adjustment The speech unit has two controls at the rear for adjustment of speech levels Volume A Speech level at the Entrance Panel Volume B Speech level at the Telephone If feedback is experienced a howl or whistle turn both controls to off and then slowly adjust each up in turn until a satisfactory level of speech is attained Troubleshooting No speech insufficient speech Adjust the volume levels as above then establish correct operation of the Speech Unit and telephone by disconnecting the telephone and re connecting with a short length of cable ROT only
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